High order Coherence Functions and Spectral Distributions as given by the Quantum Theory of Laser Radiation
We propose and demonstrate a method for measuring the time evolution of the off-diagonal elements $\rho_{n,n+k}(t)$ of the reduced density matrix obtained from the quantum theory of the laser. The decay rates of the off-diagonal matrix element $\rho_{n,n+k}(t)$ (k=2,3) are measured for the first time and compared with that of $\rho_{n,n+1}(t)$, which corresponds to the linewidth of the laser. The experimental results agree with the quantum theory of the laser.
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